Improvement in doob-looks



i WILLIAM D. FIELD,0F'-PRovnnlvcn1 RHODE ISLAND.

neem Paas: No.' 77,267, sans April 2s,1is6s.

i -IMPROVEMENT In Doos-Locks.

T0 `ALL WHOM IT .MAY CONCERNE. t

Beit known that l', WILLIAM D. FIELD, of the city andcounty of. Providence, and Stateof Rhode'Island, have invented a new and improved Changeable-Combination Lock;v and I do hereby declare that the following` is a full, clear, and exactdescript'ion thereof, which will enable -those skilled in theart to make and use the same, reference being had to `the accompanying. drawings, forming part .of this specification', in which-t Figure 1 represents a front elevation, partly in section, of my improved lock. Figure 2 is n. similar view, showing theparts in dierent positions. v Figure 3 is a vertical transverse section of the same, the plane of section being indicated by 'the line :t a', iig. 2. i

Figure 4 is a detail transverse section of the same, taken on the line y y,.ig. Figure 5 is a side view, partly in section, ot my improved key.V Figure 6 is a. transverse section of the same, the plane of section being` indicated by the line z z, iig. 5. Similar letters of reference indicate corresponding parte.

' This'invention relates to 'a new changeable-combinatxon lock, which is sotarranged that it can be applied to doors, and that it-can be changed withoutinconvenience, by. simply removing the Ainner plate.

The invention consists, rst, in hingng a set of tumblers, by means of knuckle-joints, to the inner end of the bolt,- in such a manner that they willbe movedback and forth by theA motion of the bolt, and so that they can be easily tnken'oii` andA changed, whenever desired.

The invention consists, second,vi n grooving the edges of the bolt, and in providing arms projecting from the outer plate of the lock-case into these grooves, so that the bolt, and with it its appendages, may be held on the lock-cause when the inner plate of the same is removed for the purpose of changing the tnmblers'.

The inv'ention consists, third,'in arranging an adjustable guard above the tumblers on the outer case-plata.

in such 'a manner that 'the ends oi' the .tumbler-s 'will strike against the lguardwhen the tumblers are raised tuo high -by a false key, sothat the tumblers cannot bemoved back and the bolt not drawn back by any other but the correct key.

The invention consists, fourth, inproviding both ends of the key with adjustable werds', those on one end being arranged in a reverse order tothose gn the otherend, so that lone end of the key'may be used for openingl or looking from the inside, while the other end will operatevfrom 'the'ontside. v

The wards of the key do only raise the tumblers, and do not operate the bolt. i

And the invention consists, fifth, in arranging a slotted revolving sleeve` between the key-hole'sinto which theeud 'of the key is fitted, the wardsiitting throughthe slot in the sleeve, so that they carry the sleeve around with them when the key is turned.

The sleeve carries a projecting arn'l, which strikes against arms projecting*fromv the' bolt, so' as t0 movthe bolt after the wards have raised-the tumblers. A

.The invention finally consists in forming the arms, which project from the bolt,'on a plate, whichis secured upon the inner face of lthe bolt, so as -to cover the ljunction of the tumbler-s and bolt.

The tumblers are *thereby heldin place, and by unscrewing the inner lock-oase plate, and then the aforesaid plate formingthe bolt-arms, the tumblers are leid bare, and can be changedat will, the wards of the key being changed accordingly.

A represents the case or shell of the lock.

The same consists ot' the outer plate, a, andthe inner plate, I), to one of' which the sides ofthe case are secured. I I

B represents the bolt.

The same passes through a side-plate of the oase, and lf'the side plates are formed onthe inner plate, I, as shown, the bolt would fall out if the inner plate is taken o the case.`

To avoid this the upper andlower edges of the bolt are grooved or tongued, and bent plates C C are secured to the outer plate a, fitting in-to the grooves of the bolt, as shown in fig. 4, or receiving the tongues of the bolt in grooves provided in their faces. I y

The outer plate a. is, by means of screws e c, or otherwise, secured to the door, and the inner plate b is, by means of screws d, secured to the outer plate, so that, when the lock is to be changed, the inner plate only need Vbe taken olf, without requiring-the removal of the whole lock. i

When the inner plate is thus taken ofi', the bolt will either be held in the sideV plate, projecting from the outer plate, or, if the s ide plates are formed on the inner plate, it will be held by means oi'A the guide-plates C G, asaforesaid, so that it cannot fall out.

D D are the tumblers. Y

The same are hinged, by means of knuckle-joints e, to the inner end of the bolt, as is clearly shown in fig. 2, and are, by means of springs ff, pressed towards the lkey-hole against the 4edge oi' a fixed guard, g, which iits into notches formed on the tumblers, when the bolt is locked or unlocked.

E is a plate, screwed upon the inner face of the bolt, so aste cover the hinged ends of the tumblers, to prevent themfrom falling out, when the inner plate b is removed,4and to lock lthem to the bolt. g

The plate E has two arms, V7i nd a', which project downwards, and which form the catches by means of which the bolt is drawn back and forth.

F is the key. Y

The same is provided with adjustable ward-s,jj, ou eachend, the same being marked, so that they canv be set in accordance with the arrangement of the tuinblers.

They are tted into theV slotted tubular ends of the key, and are held in `position by means of a headed screw, k, as is clearly shown in {igs.5 and 6.

Gr is a tube, pivoted between the plates 'a and b, and between the key-holes, so as to receive the key-spindle. i

It is slotted to receive the wards. v When the key is inserted, the tube G will be turned by means of the wards', and will, after thewards have raised the tumblers oithe guardplate g, strike, with anarm, l, with which'it is provided, as shown, against one of the arms h or z, projecting from the bolt, and will therebymove the bolt in or'out, us the case may be.

When the bolt is locked, the parts are all in the position lindicated in iig. 1.

H is an adjustable nplate, screwed upon the plate a above the'tumblers, and carries an arm, m, which is i beyond the inner ends of the tumblers, when the bolt`is locked, its outer` edge being about in line with the inner ends of the tumblers, as shown in iig.I 1.

When the' tumblers are raised by a false key, which has not the exact correct wards, some of them will either not be raised off theguard g if some of'tho wards of th false key are too short, or some of the tumblers will, by too long wards, be raised too high, as shown by red lines in iig. 1, so that, when an attempt is made to more the bolt back, the inner ends of the tumblers willv strike against the guard m, thereby preventing the bolt from being unlocked, or, if the tumbler-s are not raised oil' the guardg, the bolt will also be prevented from being unlocked. i

From the foregoing, the operation of. the lock will be easily understood.4

When the tumblers are to be chnged, the outer plate b i s taken o and also the plateE. The tumblers can then be easily taken oil' and changed. The wards ofthe key will then have to be changed accordingly, but in reversedorder, on the opposite ends of the key, so that therlock may be operated from the outside by oneend, and from. the inside by the other end of the key.

I claim as new, and desire to secure byLe'tters Patent- 1. Providin' the bolt B with ton ued or rooted` edves, substantiall as set forth, and combinine it witi'r o g v E s y s the guideplates Cr Cas described, so that it will remain on the lock when the inner plate ofthe same is removed9d Y substantially as herein shown and described.

2. Forming the a'rrns L and i, by means of which the bolt is moved, on a plate,AE, which is screwed upon 1the bolt, so that the tumblers are held in place by the said plate, and can be removed when the same is taken oif,substantially asherein shown and described.

3. The ,bolt B, plate E, oscillating and sliding tumblers springs f, and revolving tubeiG, having a pro-4 jecting arm, l,all arranged in combination with each-other and with the key F having changeable wards', and

all made and operating substantially as herein shown and described..

, WILLIAM D, FIELD.

Witnesses:

JonNR. RANDOLPH, ALBERT N. Dinamo. 

